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                <i class="fas fa-angle-double-right"></i>rust结构体
            
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            <h2 id="定义实例化结构体"><a href="#定义实例化结构体" class="headerlink" title="定义实例化结构体"></a>定义实例化结构体</h2><p>定义结构体，需要使用 struct 关键字并为整个结构体提供一个名字。结构体的名字需要描述它所组合的数据的意义.在结构体中需要有相应的属性和属性对应的类型</p>
<pre><code class="rust">fn main() {

// 创建实例模版
struct User {
    username: String,
    email: String,
    sign_in_count: u64,
    active: bool,
}

// 实例化不可变模型
let user1 = User {
    email: String::from(&quot;someone@example.com&quot;),
    username: String::from(&quot;someusername123&quot;),
    active: true,
    sign_in_count: 1,
};
}
// 实例化可变模型
let  mut user2 = User {
    email: String::from(&quot;someone@example.com&quot;),
    username: String::from(&quot;someusername123&quot;),
    active: true,
    sign_in_count: 1,
};
}

// 调用与修改
println!(&quot;{}&quot;, user2.email)
user2.email = String::from(&quot;other@example.com&quot;)</code></pre>
<h3 id="使用函数来返回并创建实例化模型"><a href="#使用函数来返回并创建实例化模型" class="headerlink" title="使用函数来返回并创建实例化模型"></a>使用函数来返回并创建实例化模型</h3><pre><code class="rust">fn main() {
    let user = return_struct(String::from(&quot;xx&quot;),2);
    println!(&quot;{}&quot;,user.name);
}

struct User {
    name: String,
    age: i32,
    active: bool,
    sigin_in_count: i32,
}

fn return_struct(name: String,age: i32 ) -&gt; User {
    User {
        //同名字段
        //1. name: name,
        //2. name,
        name,
        age,
        active: true,
        sigin_in_count: 1,
    }
}
</code></pre>
<h3 id="实例更新"><a href="#实例更新" class="headerlink" title="实例更新"></a>实例更新</h3><pre><code class="rust">let user2 = User {
    email: String::from(&quot;another@example.com&quot;),
    username: String::from(&quot;anotherusername567&quot;),
    ..user1
}; </code></pre>
<h3 id="元组结构体"><a href="#元组结构体" class="headerlink" title="元组结构体"></a>元组结构体</h3><p>没有字段名 只有字段类型</p>
<pre><code class="rust">fn main() {
struct Color(i32, i32, i32);
struct Point(i32, i32, i32);

let black = Color(0, 0, 0);
let origin = Point(0, 0, 0);
}</code></pre>
<h3 id="方法语法"><a href="#方法语法" class="headerlink" title="方法语法"></a>方法语法</h3><p>方法语法同函数类似，但是方法实在结构体的上下文中被定义的，并且他们的第一个参数是self，它代表了调用该方法的结构体实例</p>
<p>我们将某个实例能做的所有事情一起放在impl(implementation)中</p>
<pre><code class="rust">struct Rectangle{
        width: u32,
        height: u32,
}
// 必须同名
impl Rectangle{
    fn area(&amp;self) -&gt; u32{
        self.width * self.height
    }
}
fn main() {
    let rect1 = Rectangle{width: 30,height: 50};

    println!(
        &quot;the area is {}&quot;,rect1.area()
    );
}
</code></pre>
<p>其中self表示调用该方法的结构体实例</p>

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